Sound-muffling pad for typewriting machines



B. J. DOWD.

SOUND MUFFLING PAD FOR TYPEWRITING MACHINES. APPLICATION FILEDINOV. 3. 1921.

1,420,082. Patentq June 20,1922.

mnimlliili "MW In UNITED- STATES.

rg reu'r OFFICE.

O ROYAL TYPEWRTTER OF NEW YORK.

SOUNDLMUFFLING PAD FOR TYPEWRITING MACHINES.

Specification of Letters Patent. Patent d J 20 1922 Application filed November 3, 1921. Serial N 0. 512,542.

T 0 all whom it may concern:

Be it known that I, BERNARD J. Down, a citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Im rovements in Sound- Mufliing Pads for ypewriting Machines, of which the following is a specification.

The object of this invention is to provide means for absorbing shocks and muffling or deadening sounds produced by a typewriter machine while in operation, which sounds are as a rule transmitted to the desk or table on which the machine is supported and are by such machine or by such support increased to a very great extent. These sounds are largely produced by the shifting of the mechanism for upper and lower case printing and are also responsible for a large part of the noise made in the operation of the machine.

According to my invention I provide a frame or plate, preferably metallic, which is adapted to be attached at its four corners to the feet or four corners of the typewriter and which supports a mat or cushion of felt or similar sound absorbing material. The frame or plate is perforated at its four corners to receive fastening devices which attach it to the machine and it also carries on the four corners cushioned feet adapted to rest on the desk or table which supports the machine. In order to secure the felt carrying frame or plate to the table or support, I employ fastening devices which are connected with the support and engage parts of the felt carrying frame or plate. Other features of the invention will be hereinafter described.

In the accompanying drawings;-

Figure 1 is a side view of a partof the frame of a typewriting machine to which the pad is attached and it also shows part of a desk top to which the pad is secured.

Figure 2 is a bottom plan view of the pad plate.

and in section on the line 3-3 of Figure 1. showing particularly the manner of attaching the pad to the machine support.

A part of the side frame of a Royal typewriter machine is indicated at A. The frame is formed with feet a at its corners and it will be observed that these feet ex- Figure 3 is a view on an enlarged scale tend for only a short distance below the edges of the frame. The mat B is preferably made of felt or other similar sound absorbing material and it is supported in a frame or plate G preferably made of metal. This plate is of such size and shape as to extend across the bottom of the machine in rear of thekeyboard, as shown in Figure 2', and therefore does not cover the entire bottom portion of the machine. This frame or plate is formed with extensions 0 which lie under the machine feet and these extenslons are perforated to receive screws or snnilar fastening devices D which secure the frame or plate C to themachine frame and also hold in place the cushioned feet E made of rubber or similar material. These feet are hollow, as shown, and the heads of the screws D are thin or fiat so that the rubber feet are free to be compressed and expanded.

The mat B is supported in the frame or plate C, which latter is preferably flanged at its outer edges as indicated at c to better hold the mat in place. This mat covers the entire bottom portion of the machine frame in the rear of the keyboard.

In order to secure the frame or plate to a desk top or'other support F, I employ fastening devices G which extend through the support F and engage nuts H carried by the frame or plate C. As shown in the drawings, the nuts H are flanged at h and have flattened sides h which engage straight edges 0 of the holes made in the plate to receive the nuts. The nuts are thus D-shape in cross section. In this way the nuts are prevented from turning when the screws G are being applied.

In order to strengthen or stiffen the frame or plate, it is formed with a head 0 and in order that access may be had to certain adjusting devices of the machine, the frame or plate is bent or formed with a recess as indicated at X.

-By the devices shown,-the pad may be securely fastened to the typewriting machine and also firmly attached to the desk or support. The pad mufiies or deadens sound or noise tending to emanate from the interior of the machine while the feet. absorb noises tending to pass from. the desk or support. I The pad is of simple con struction. The frame as plate 0 may be made by a simple stamping process which gives it the required shape at a single operaa i this plate, as the frame or plate presents an uninterrupted closure under the machine.

I claim as my invention:

1. A sound absorbing pad for typewriting machines, comprising a frame of sub stantially the contour of the" machine base, a sound absorbing mat therein, feet of elastic material c'arried by the frame, and means for attaching the feet to the frame and for attaching the pad to the machine.

2. A sound absorbing pad for typewriting machines, comprising a frame, a sound absorbing mat mounted therein, feet of elastic material carried by the frame, fastening devices for attaching the feet and the pad to the machine, nuts mounted in the frame and held against turning, and screws engaging the nuts for attaching the pad to its support.

3. A sound-absorbing pad for typewriting machines, comprising a frame of substantially the contour of the machine base, a sound-deadening mat thereon, feet of class tic material attached to the corners of the frame, and means engaging the frame for attaching the pad to a, support.

4. A sound-absorbing pad for typewrit ing machines, comp-rising a frame of substantially the contour of the machine base, a sound-deadening mat thereon, feet of elastic material attached to the frame, and means having a threaded engagement with the frame for attaching'the pad to a support.

5. A sound absorbing pad for typewriting machines comprising a flanged frame having substantially the contour of the machine frame in the rear of the keyboard and having a recess in the rearto permit access to parts of the machine, a sound deadening mat mounted in said frame, feet at the corners of-the frame, means for attaching the feet and frame to the machine and means for attaching the pad to a support.

6. A sound absorbing pad for typewriting machines comprising a frame of substantially the contour of the machine base, feet-of elastic material at the corners of the frame, means for attaching the feet to the frame and the frame to the machine, a sound deadening mat mounted in said frame, and devices" for fastening the pad to a support, said devices being covered by the sound deadening mat.

7. The combination of a typewriting machine and a frame adapted to be secured thereunder and extending between the corners thereof, a mat associated with one side ofthe frame for absorbing sounds created in the operation of the machine, and a plurality of rubber feet associated with the other side of the frame for cushioning the typewriting machine.

8. The combination of a. typewriting machine and a frame adapted to be secured thereunder and extending between the corners thereof, a sound absorbing mat associated with one side of the frame, a plurality of cupped feet associated with the other side of the frame, and means for securing the frame, mat and feet to the machine.

9. The combination with the base of a typewriting-machine of a sound mufiiing pad underlying the same, and extending between the corners thereof, said pad comprising a frame and a mat associated therewith and means engaging the base to draw the pad into close contact with the edges thereof.

10. The combination with the base of a typewriting machine of a sound muffiing pad underlying the same, and extending between the corners thereof, said pad comprising a frame, a mat on one side thereof, and rubber feet on the other side thereof, and

- means engaging the base to hold the feet in place and draw the pad into close contact with the edges of said base.

In testimony whereof, I have hereunto subscribed my name.

BERNARD J. DOW D. 

